This story is still unfolding. Looks like another armed maniac has struck and killed a number of people. According to this news item in New York Post, at least 4 people have been killed by a man in Bridgeville, Pennsylvania (outside Pittsburgh) in an LA Fitness Center. The man reportedly entered a busy gym carrying a gun and a gym bag and opened fire. According to the report, the gunman appears to have turned the gun on himself after committing the murders.
As the events unfold, this is likely to open another debate between pro-gun and anti-gun activists in the country. The anti-gun activists will argue that the person should not have been able to buy a gun in the first place, and the pro-gun activists will counter that each gym-goer should have been armed to face the madman.